期刊
FRONTIERS IN VETERINARY SCIENCE
卷 8, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fvets.2021.663577
关键词
heat stress; Ruminococcus; enzyme; biochemistry; phagocytic assay; pathology; bursal gene
资金
- Deanship of Scientific Research at Princess Nourah bint Abdulrahman University through the Fast-track Research Funding Program
The study demonstrated that heat stress had negative effects on the growth performance, serum biochemistry, tissue antioxidants, and phagocytic assay of broilers, leading to pathological lesions in internal organs and altered gene expression related to heat stress. However, supplementation of Ruminococcus alone or with digestive enzymes mitigated these negative effects and improved the parameters studied.
This research was conducted to evaluate the impact of dietary or drinking water Ruminococcus sp. supplementation and/or heat stress (HS) on the growth, serum biochemistry, tissue antioxidant, phagocytic assay, histopathology, and bursa gene expression of broilers. Day-old broiler chicks were allotted into six groups according to HS and/or Ruminococcus with or without enzyme supplementation. The first group was the control one, with a formulated diet and normal environmental temperature but without any supplement. The second group fed on Ruminococcus-supplemented diet (1 kg/kg diet). The third group fed on a formulated diet without supplement, and Ruminococcus and digestive enzymes were given in drinking water (0.1 ml/L). The fourth one was the heat stress group, with a normal formulated diet. The fifth and the sixth groups served as second and third groups, respectively, but with heat stress. The results of this experiment indicated that thermal temperature negatively affected the parameters of growth performance, serum biochemical, tissue antioxidants, and phagocytic assay. Moreover, heat stress led to pathological lesions in the internal organs and affected the expression of some genes related to heat stress, including proapoptotic genes such as caspase8 and bax, inflammatory genes such as NF-kappa beta 1, and heat shock protein such as HSP 70 in the bursal tissue. These bad effects and abnormalities were mitigated by Ruminococcus alone or with enzyme supplementation, which improved all the above-mentioned parameters.
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